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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Analysis of Pierce engine efficiency, focusing on power output, crankshaft balancing, and camshaft drive.

Identifier  ExFiles\Box 173\1\  img173
Date  4th February 1934
  
-6-

IM/R.D/ST.4.2.34.

Pierce Engine Efficiency.

They are getting about 180 B.H.P. out of 460 cu.ins., not a bad power output compared with the Phantom in considering that they are a side valve engine.

Crankshaft only 70% balanced (no big end balanced, 70% of pin and webs only). They have a camshaft period which they say rattles the valve gear and which they can alter with the crankshaft damper. Seems to be due to -

(1) Having a rubber type crank damper which we know is not 100% efficient.

(2) No spring drive to camshaft but a short chain only.

Hs{Lord Ernest Hives - Chair}/ita.
  
  


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